Hello and welcome.
Depends what you are looking for really! In order to determine if it is useful, you have to define what you are going to use Wing Chun for. Do you want to learn how to fight? Want to get in shape? Want to learn a traditional Chinese martial art?
A lot comes down to the teacher and the methods they use in class. Some Wing Tsun classes might focus more on conditioning or use sparring, for example.
"Let your food be your medicine, and your medicine be your food"